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Commit 556e7c13 authored by Vipin Deep Kaur's avatar Vipin Deep Kaur
Browse files

spi: spi-qcom-geni: Clear the RX fifo if FIFO has data after timeout 



Dummy read the rx fifo in case RX fifo has data after a timeout. This
is to clear the spurious rx watermark interrupt that keeps firing due
to stale data in the rx fifo.

Change-Id: I4094261e00d61b07cd53a7ae508efdad73c3f022
Signed-off-by: default avatarVipin Deep Kaur <vkaur@codeaurora.org>
parent f24a5982

drivers/spi/spi-geni-qcom.c

+12 −0
Original line number Diff line number Diff line
@@ -1162,9 +1162,21 @@ static void handle_fifo_timeout(struct spi_geni_master *mas, 
					struct spi_transfer *xfer)

{

	unsigned long timeout;

	u32 rx_fifo_status;

	int rx_wc, i;



	geni_se_dump_dbg_regs(&mas->spi_rsc, mas->base, mas->ipc);

	reinit_completion(&mas->xfer_done);



	/* Dummy read the rx fifo for any spurious data*/

	if (xfer->rx_buf) {

		rx_fifo_status = geni_read_reg(mas->base,

					SE_GENI_RX_FIFO_STATUS);

		rx_wc = (rx_fifo_status & RX_FIFO_WC_MSK);

		for (i = 0; i < rx_wc; i++)

			geni_read_reg(mas->base, SE_GENI_RX_FIFOn);

	}



	geni_cancel_m_cmd(mas->base);

	if (mas->cur_xfer_mode == FIFO_MODE)

		geni_write_reg(0, mas->base, SE_GENI_TX_WATERMARK_REG);